[BioC] log values of affybatch data

James MacDonald jmacdon at med.umich.edu
Tue Sep 30 14:12:24 MEST 2003

Assuming you want the log of the PM data, you would do log2(pm(abatch)).
For log2(MM), substitute mm for pm.

Note also that expresso and rma return logged data, so you would not
want to input pre-logged data to these functions.


James W. MacDonald
Affymetrix and cDNA Microarray Core
University of Michigan Cancer Center
1500 E. Medical Center Drive
7410 CCGC
Ann Arbor MI 48109

>>> Stephen Nyangoma <S.Nyangoma at cs.rug.nl> 09/30/03 12:50PM >>>
Hi all,
How can I compute the logs of the Affybatch data?


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